i. Show that for an ideal solution of A and B, the mole fractions of A in vapor phase in equilibrium with solution is

_ = (_ _/_)/ (1 + _ ( / 1))

ii. A certain ideal liquid mixture of hexane and octane solution at 80C has a vapor pressure of 500 mmHg. At 80C the vapor pressures of pure hexane and octane are 1067 and 175 mmHg, respectively. Find the mole fractions in the liquid mixture and in the vapor phase.